Closed metallic corrugated wall and method of making same



Dec. 18, 1928. 1,695,948

F. K. BEZZENBERGER CLOSED METALLIC CORRUGATED WALL AND METHOD OF MAKING SAME Filed Aug. 21, 1924 ATTORNEY-3 Patented Dec. 18, 1928.

' UNITED STATES FRED K. IBEZZENBERGER, OF CLEVELAND HEIGHTS, OHIO, ASSIGNOB, BYMESNE .AS-

SIGNMENTS, TO THE FULTON SYLPHON COMPANY, OF KNOXVILLE, TENNESSEE, A

CORPORATION OF DELAWARE.

CLOSED METALLIC CORRUGATED WALL AND METHOD OF MEKING SAME.

Application, filed August 21, 1924. Serial No. 133,322.

The present invention relating, as indi- I cated, to closed metallic corrugated walls tion, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail one method and one product exemplifying my invention, such disclosed procedure and product constituting, however, but one of various applications of the principle of my invention. I

In said annexed drawing Fig. 1 is a transverse longitudinal section showing a bellows and a die or mold in which the bellows is received ready for the formation on the end of the bellows of a closure member therefor; Fig. 2 is a-similar view showing a bellows with an end closure member integrally secured thereto; and Fig. 3 is a view similar to Fig. 1 but showing-the uncorrugated end of a tube prior to the corrugat-ing operation in position in a mold for the formation of an end closing member thereon.

In Fig. 1 I have shown a corrugated metallic bellows -1 provided with a series of substantially parallel corrugations 2, 3, 4, etc. The bellows, while here represented as being completely formed, may, for the purposes of this description and of this invention, be considered as being either in its finished state or in any intermediate stage of manufacture, that is, with the corrugations either fully or partly formed or as a tube prior to the formation of any corrugations, as shown in Fig. 3. In forming the end.

closure on the bellows I'dispose the, end 5 of the bellows 1 within an opening formed in a diet, after first mounting in this-open end 5 of the tubular wall an end member 7 in the form of a disk which is provided with an up-standing flanged button or head 8.

The die 6 is provided with portions 9, which engage directly against the side of the end 5 of the wall, and between these portions 9 of the die and the outer surface of the corrugation 2 I interpose heat insulating plates 10 of any suitable material, to prevent an undesirable transmission of heat to adjacent corrugations with the resultant reduction of temper therein. The die is also provided with a pouring spout or conduit 11.

\Vhen the bellows is thus mounted in place in the die molten metal, either of the same composition as the bellows or of some composition which will cast integrally thereto when it is poured into the die through the opening 11, is allowed to flow around the inner projecting end of the bellows and around the upper surface and projecting head on the closure member 7, and

is there allowed to cool, after which the die is remvoed, leavingthe bellows int-he form shown in Fig. 2. The end portion 5 of the bellows is then embedded in a cast disk or head 12, which consists of the original closure member 7, the head 8 of which is now firmly embedded in the larger disk which has been cast to the end of the bellows.

If the end of the original tube is to be closed prior to the formation of the corru-' gations therein then tube 14: is mounted Within a die 15, (see Fig. 3), and the closure member 16 is introduced into, the open end of the tube, after which metal is cast about the projecting inner end of the tube and against the upper surface of the closure -member 16 in the-same manneras that already described, with the exception that it is now unnecessary to introduce any protecting elements or means for preventing the transmission of heat along-the tube, as is the case when the corrugations are already formed, when. the most adjacent corrugations mayinsome casesbe annealed by the temperature to which they. are subjected by the closely adjacent presence of the molten,

metal.

The advantages of the present invention are the econoiny and convenience of thus closing the ends of the .bellows, while at the same time reinforcing these otherwise weak ends by a considerable body of metal which material of the tubular wall, the metal to be used in the cast head and the service to which the finished product is to be at, but if the end members are formed by ie casting the process can be very 'rapidl and conveniently carried out by met od's well known in this art.

'Other modes of applying the principle of my invention may be employed instead of the one explained, change eing made in the method or construction, provided the elements statedby any of the'following claims or the'equivalent of such stated elements be employed, whether produced by my preferred method or byothers embodying steps equivalent to those stated in the following claims.

"I therefore particularly point out and distinctly claim as my invention 1. In a method of forming an integral closure about the end of a metal bellows, the steps which consist in snugly fitting within the projecting end portion of a bel lows a metal plate, mounting such end within a 11 old chamber fitting snugly against lows end within a mold chamber which em-- braces the bellows end, and pouring molten ,metal into said chamber into contact with said end and said end member while protecting the corrugations from the heat of the molten metal.

3. In a method of forming an integral closure for a flexible metallic bellows, the steps 'WlllCll include providing an interlocking end on the bellows, fitting to the. end

portion of the bellows an end member provided with an interlocking pro'ection,

vmo mting the bellows end within a c lamber which fits around the end portion of the be]- lows, and pouring molten .metal into said chamber about said end into interlocking relation with said end member.

Signed by me this 18th day of August, 1924.

FRED K. BE'ZZEN-BERGER. 

